STM32F407ADC采集1MHz信号
时间: 2023-12-23 13:04:19 浏览: 104
STM32F407ADC可以采集1MHz信号,但是需要注意以下几点:
1. ADC的采样速率受到ADC时钟频率和采样时间的限制。在STM32F407的最大时钟频率下,ADC最高采样速率为2.4MHz。因此,需要将ADC时钟频率设置到最大值,并设置合适的采样时间,以达到最大采样速率。
2. ADC的精度会影响采样速率。在STM32F407中,ADC的精度可选12位或10位。较高的精度会导致采样时间更长,因此采样速率会相应降低。
3. 输入信号的幅度也会影响采样速率。当输入信号幅度较小时,需要增加放大器放大信号,以提高信号幅度,从而提高ADC的采样速率。
综上所述,要采集1MHz信号,需要选择合适的ADC时钟频率和采样时间,并适当增加输入信号的幅度。同时,还需要根据具体的应用场景和精度要求选择合适的ADC精度。
相关问题
基于stm32f103的adc采集的代码
以下是基于STM32F103的ADC采集的代码示例:
```c
#include "stm32f10x.h"
#include "stdio.h"
#define ADC1_DR_Address ((uint32_t)0x4001244C)
__IO uint16_t ADC1ConvertedValue = 0;
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while (ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while (ADC_GetCalibrationStatus(ADC1));
}
void USART_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void ADC1_IRQHandler(void)
{
if (ADC_GetITStatus(ADC1, ADC_IT_EOC) != RESET)
{
ADC_ClearITPendingBit(ADC1, ADC_IT_EOC);
ADC1ConvertedValue = ADC_GetConversionValue(ADC1);
USART_SendData(USART2, ADC1ConvertedValue >> 8);
while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
USART_SendData(USART2, ADC1ConvertedValue & 0xFF);
while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
}
}
int main(void)
{
GPIO_Configuration();
ADC_Configuration();
USART_Configuration();
NVIC_Configuration();
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while (1);
}
```
在这个示例中,我们使用了ADC1和PA0引脚进行采集和输入。`ADC_Configuration()`函数设置ADC的配置,包括通道选择和采样时间。在`ADC1_IRQHandler()`中,我们读取转换值并通过USART发送到计算机上。在main函数中,我们启动了ADC转换,然后进入一个无限循环等待转换完成并发送数据。
帮我写一个使用stm32F407开发板的用adc采集电压程序,以串口输出电压
好的,以下是使用STM32F407开发板采集电压并通过串口输出的程序。在本程序中,我们使用了ADC1通道0来采集电压,并将采集到的电压值通过USART2串口输出到PC机上。
```c
#include "stm32f4xx.h"
#include "stdio.h"
#define ADC1_DR_ADDRESS ((uint32_t)0x4001204C)
void USART2_Init(void);
void ADC1_Init(void);
int main(void)
{
USART2_Init();
ADC1_Init();
float voltage;
while (1)
{
//启动ADC转换
ADC_SoftwareStartConv(ADC1);
//等待转换完成
while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
//读取ADC值并计算电压值
uint16_t adc_value = ADC_GetConversionValue(ADC1);
voltage = (3.3 * adc_value) / 4096;
//将电压值通过串口输出到PC机上
char buffer[50];
sprintf(buffer, "Voltage is %.2f V\r\n", voltage);
USART_SendString(USART2, buffer);
//延时一段时间
for (int i = 0; i < 1000000; i++);
}
}
void USART2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
//使能GPIOA和USART2时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//初始化GPIOA2和GPIOA3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//将PA2和PA3引脚复用为USART的TX和RX引脚
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
//USART2初始化配置
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART2, &USART_InitStructure);
//使能USART2
USART_Cmd(USART2, ENABLE);
}
void ADC1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
//使能GPIOA和ADC1时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//初始化GPIOA0
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//ADC1初始化配置
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
//配置ADC1通道0
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);
//使能ADC1
ADC_Cmd(ADC1, ENABLE);
}
```
在本程序中,我们使用了USART2串口进行输出。在初始化时,我们将PA2和PA3引脚复用为USART的TX和RX引脚,并使用115200波特率进行通信。
在ADC1初始化时,我们使用了ADC1通道0进行采集,并将采样时间设置为15个时钟周期。在主循环中,我们启动ADC转换,并等待转换完成。之后,我们读取ADC值并计算出电压值,并通过串口输出到PC机上。
为了防止串口输出过快导致数据溢出,我们在输出完一次电压值后进行了一段短暂的延时。
注意:本程序只是一个简单的示例,实际使用中需要根据具体情况进行修改。
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